Effects of cathode electrolyte interfacial (CEI) layer on long term cycling of all-solid-state thin-film batteries

JOURNAL OF POWER SOURCES

卷:324

Article

Wang, Ziying¹  Lee, Jungwoo Z.¹  Xin, Huolin L.²  Han, Lili²  Grillon, Nathanael³  Guy-Bouyssou, Delphine³  Bouyssou, Emilien³  Proust, Marina³  Meng, Ying Shirley¹ 

[1] Univ Calif San Diego, Dept NanoEngn, 9500 Gilman Dr, La Jolla, CA 92093 USA

[2] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA

[3] STMicroelectronics, CS 97155, F-37071 Tours 2, France

关键词: Lithium-ion battery;    Thin-film battery;    Interfacial phenomena;    Interface resistance;    Solid electrolyte;   

DOI  :  10.1016/j.jpowsour.2016.05.098

来源: Elsevier

【 摘 要 】

All-solid-state lithium-ion batteries have the potential to not only push the current limits of energy density by utilizing Li metal, but also improve safety by avoiding flammable organic electrolyte. However, understanding the role of solid electrolyte electrode interfaces will be critical to improve performance. In this study, we conducted long term cycling on commercially available lithium cobalt oxide (LCO)/lithium phosphorus oxynitride (LiPON)/lithium (Li) cells at elevated temperature to investigate the interfacial phenomena that lead to capacity decay. STEM-EELS analysis of samples revealed a previously unreported disordered layer between the LCO cathode and LiPON electrolyte. This electrochemically inactive layer grew in thickness leading to loss of capacity and increase of interfacial resistance when cycled at 80 degrees C. The stabilization of this layer through interfacial engineering is crucial to improve the long term performance of thin-film batteries especially under thermal stress. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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